American Society for Clinical Pathology (ASCP) Histotechnician Certification Practice Exam

What is the mandated order for collecting blood from neonates during capillary puncture?

1. Hematology, Chemistry, Blood Bank

2. Blood Bank, Chemistry, Hematology

3. Chemistry, Hematology, Blood Bank

4. Chemistry, Blood Bank, Hematology

The correct answer is: Hematology, Chemistry, Blood Bank

The mandated order for collecting blood from neonates during capillary puncture is important to minimize the risk of contamination and ensure accurate test results. The correct sequence begins with hematology, followed by chemistry, and then blood bank. In this order, hematology tests typically require whole blood and are sensitive to any contamination from other sources, which could alter the results. By collecting hematology samples first, any potential interference from chemical additives or preservatives found in other blood collection tubes is minimized. Chemistry tests are performed next because they can tolerate some degree of contamination better than hematology tests. Finally, blood bank samples are collected last to preserve the integrity of serological testing, which is critical for transfusion compatibility but less affected by contaminants from earlier samples. This sequence is crucial in ensuring that the blood collected is as accurate as possible and reduces the likelihood of erroneous results due to cross-contamination among different testing categories, which could lead to misdiagnosis or inappropriate treatment options for neonates.